会议名称：2023世界木材日研讨会暨第五届国际林联（IUFRO）林产品文化研究组讨论会
会议时间：2023年3月22日

报告嘉宾：Ondrej Dvoracek
嘉宾简介：奥地利Wood K plus – Kompetenzzentrum Holz GmbH高级研究员（Wood K plus，欧洲木材和木材相关可再生资源领域的领先研究机构）

摘要：
Wood machining is the most important procedure in wood utilization. From tree harvesting, through the manufacturing of lumber and furniture, to the recycling or burning of wood waste, cutting can be found at every stage of wood processing. In temperate climate zones nowadays forest composition is radicaly changing. Broad-leaved species are replacing needle-bearing plants. The novel device simplifying the complexity of wood process observation is developed to enable the detailed analysis of wood cutting. The unique worldwide device works on the principle of a rotor arm with a diameter of 4 m. Therefore, the movement of its end can be considered linear. Additionally, the rotor arm reaches an angular speed of up to 442 RPM. That corresponds to the tangential cutting velocity of 93 m·s-1. Single cut per examination is conducted during measurement. The stand-alone cut at this speed has never been performed before. The study employs oak (Quercus robur), beech (Fagus sylvatica), spruce (Picea abies), tree of heaven (Ailanthus altissima), paulownia (Paulownia tomentosa), and locust (Robinia pseudoacacia) wood at varying moisture content levels (0 – <32%). Uncut chip thickness (0 – 0.5 mm), cutting velocity (5 – 90 m·s-1) and cutting fibre angles (parallel to across the grain) are other factors incorporated in the study. Some tests are observed by high-speed cameras at a frame rate of 200 000 fps. Insight into the wood cutting shows that cutting velocity is the key parameter that greatly non-linearly influences cutting force. All obtained data serves as input for a mathematical model establishment for cutting force prediction. Finally, the prediction model is tested by an independent set of data. Results of the model testing show statistically significant sameness of model and test data set.

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